diff --git a/inc/lib_base.php b/inc/lib_base.php
index 52b9aeedd4aef70d05b9bfb5d6f0e42897d2e4aa..4b5fb06a498f26064adb1f2abc1a55ff97811e00 100755
--- a/inc/lib_base.php
+++ b/inc/lib_base.php
@@ -33,6 +33,7 @@ session_start();
 // calculate the documentroot
 $SERVERROOT=substr(__FILE__,0,-17);
 $DOCUMENTROOT=$_SERVER['DOCUMENT_ROOT'];
+$SERVERROOT=str_replace("\\",'/',$SERVERROOT);
 $count=strlen($DOCUMENTROOT);
 $WEBROOT=substr($SERVERROOT,$count);
 if($WEBROOT{0}!=='/'){